Addition reaction-curable liquid silicone rubber...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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Details

C528S015000, C528S031000, C528S032000, C428S405000, C525S477000, C525S478000, C525S479000

Reexamination Certificate

active

11151255

ABSTRACT:
An addition reaction-curable liquid silicone rubber composition includes an organopolysiloxane containing at least one Si-bonded vinyl group only at each end of its backbone and having a viscosity of from 1 to 1,000 Pa·s at 25° C., an organopolysiloxane containing at least two Si-bonded vinyl groups only in side chains on its backbone and having a viscosity of from 0.1 to 100 Pa·s at 25° C., the amount of siloxane units bonded to the vinyl groups being from 2 to 20 mole % of its total siloxane units, finely divided silica having a specific surface area of at least 50 m2/g, hexamethyldisilazane, water, an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms per molecule, and a hydrosilation catalyst. Another addition reaction-curable liquid silicone rubber composition additionally includes a specific non-functional dimethylpolysiloxane. The silicone rubber compositions are cured into products having a hardness of at least 75 as measured by a type-A durometer and an elongation at break of at least 200%.

REFERENCES:
patent: 5519082 (1996-05-01), Yoshino
patent: 6245875 (2001-06-01), Wang
patent: 2001/0039323 (2001-11-01), Achenbach et al.
patent: 2004/0132947 (2004-07-01), Achenbach et al.
patent: 0 305 073 (1989-03-01), None
patent: 0 622 421 (1994-11-01), None
patent: 0 669 376 (1995-08-01), None
patent: 0 798 342 (1997-10-01), None
patent: 7-331079 (1995-12-01), None

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